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복합고분자 PC/PBT 배합비 산출 및 기계적물성 분석기술
이금향(Keumhyang Lee),곽동환(Donghwan Kwak),윤성구(Sunggoo Yun),신민철(Minchul Shin),황덕형(Duckhyoung Hwang),안상두(Sangdoo Ahn) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
Polymer blends and composites are widely used in automobile parts. In these compounds, the most important factor is the blend ratio. So, we have carried out the quantitative analysis for the PC/PBT blend using TGA and new analysis method of NMR spectroscopy. A further study, we also studied prediction model equations of mechanical properties of tensile, bending and impact strength from the compositional results. In conclusion, this advanced analytical technique will help us to develop new products and deal with field claims in automobile industry.
이태승(Taeseung Lee),맹주영(Jooyoung Maeng),곽동환(Donghwan Kwak),정기연(Kieyoun Jeong),정순준(Soonjoon Jung) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
As vehicles have been more luxurious, high quality of material is not only required but also human-wised quality is important to facilitate residence of indoor vehicle. In particular, smell of indoor vehicle is one of the most important factors, which is determining possibility of purchasing vehicles. Customers sense smell of vehicle at first when they open the door of the vehicle. Therefore, our research shows the analysis method on the smell of indoor vehicle to identify the level of smell and to find out the causes of smell. It also introduces the improved method of the interior components and new materials (in particular, surface treatment), are as well as actual examples where these improvement are reflected on.
핵자기공명 분광법을 이용한 PC/PBT 블렌드의 에스테르 교환에 관한 반응속도 연구
이금향(Keumhyang Lee),신지영(Jiyoung Shin),유효연(Hyo-Yeon Yu),곽동환(Donghwan Kwak),김창근(Chang Keun Kim),안상두(Sangdoo Ahn) 한국고분자학회 2016 폴리머 Vol.40 No.3
¹H NMR 분석방법을 이용하여 여러가지 가열 조건하에서 폴리카보네이트/폴리(부틸렌 테레프탈레이트) (PC/PBT) 블렌드의 에스테르 교환반응 속도에 관하여 조사하였다. 일반적으로 고분자 배합비를 산출하는데 사용하는 TGA 측정 과정에서, PBT의 열분해 온도에 이르기 전에 교환반응이 매우 활발히 일어난다는 것을 확인하였으며, 이에 따라 상대적으로 높은 열분해 온도를 가지는 PC의 함량이 원래 혼합된 것보다 적은 것처럼 관측된다는 것을 알았다. 200, 250, 300℃에서 가열시간을 증가시키면서 PC/PBT(50:50 wt%) 블렌드와 분말 혼합물의 에스테르 교환반응률을 측정하였고 이를 통하여 반응속도 상수를 결정하였다. 분석한 모든 온도에서 블렌드의 반응속도 상수가 더 크게 관측되었으며, 250℃ 이상의 고온에서는 짧은 가열시간에도 교환반응이 상당히 진행된다는 것을 확인할 수 있었다. The kinetic properties of transesterification reaction in polycarbonate/poly(butylene terephthalate) (PC/PBT) blends were investigated by ¹H NMR spectroscopy under various annealing conditions. During the TGA analysis which is commonly used for composition analysis of polymer blends, the exchange reaction occurred very actively before it reached the thermal decomposition temperature of PBT. Hence, the composition of PC in thermogram seemed to be less than the original value. The kinetic constants of transesterification in PC/PBT (50:50 wt%) blend and powder mixture at 200, 250, and 300℃ were calculated from the degrees of transesterification obtained while increasing the annealing time. It was found that the kinetic constants for the blend were greater than the mixture, and the exchange reaction was considerably progressed even in the short annealing time.
이기석(Kisuk Lee),이윤희(Yoonhee Lee),김유석(Yoosuk Kim),곽동환(Donghwan Kwak) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
This paper is for the carbon black grade analysis technique to understand the damping rubber properties. Other analysis method reported by ASTM and another paper is not enough to predict carbon black grade of vulcanized rubber product. In this paper, unknown carbon black grade in the vulcanized damping rubber was analyzed successfully by the systematic analysis methods. The ultramicrotome pretreatment method, TEM analysis method and FEG-SEM analysis method were used for this purpose.